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DC Motors

DC Motors
A dc motor can be easily identified by

Winding
Size of conductor
Yoke
Commutator

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DC Motors
The iron loss in dc motor depends on

Flux only
Speed only
Both flux and speed
None of the listed here

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DC Motors
In D.C. machines the residual magnetism is of the order of

20 to 25 percent
50 to 75 percent
2 to 3 percent
10 to 15 percent

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DC Motors
______ motor has the best speed regulation.

Cummulative compounded
Series
Shunt
Differentially compounded

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DC Motors
Which of the following application requires high starting torque?

Locomotive
Centrifugal pump
Air blower
Lathe machine

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DC Motors
The running speed of a dc series motor is basically determined by

Load
None of the listed here
Field excitation
Armature reaction

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